<template>
<div class="row">
  <div v-for="column in columnList" :key="column.id" class="col-4 mb-4">
    <div class="card h-100 shadow-sm">
      <div class="card-body text-center">
        <img :src="column.avatar" :alt="column.title" class="rounded-circle border border-light w-25 my-3" />
        <h5 class="card-title">{{column.title}}</h5>
        <p class="card-text text-left">{{column.description}}</p>
        <a href="#" class="btn btn-outline-primary">进入专栏</a>
      </div>
    </div>
  </div>
</div>
</template>

<script lang="ts">
import { defineComponent, PropType, computed } from 'vue'
export interface ColumnProp {
  id: number;
  title: string;
  avatar: string;
  description: string;
}
export default defineComponent({
  name: 'ColumnList',
  props: {
    list: {
      type: Array as PropType<ColumnProp[]>,
      require: true
    }
  },
  setup (props) {
    const columnList = computed(() => {
      if (props.list && props.list.length) {
        return props.list.map(column => {
          if (!column.avatar) {
            column.avatar = require('../assets/logo.png')
          }
          return column
        })
      } else {
        return []
      }
    })
    return {
      columnList
    }
  }
})
</script>

<style scoped>

</style>
